Vacancies in graphene: Dirac physics and fractional vacuum charges
| العنوان: | Vacancies in graphene: Dirac physics and fractional vacuum charges |
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| المؤلفون: | Eric Akkermans, Yaroslav Don, O. Ovdat |
| المصدر: | Physical Review B. 102 |
| بيانات النشر: | American Physical Society (APS), 2020. |
| سنة النشر: | 2020 |
| مصطلحات موضوعية: | High Energy Physics - Theory, Dirac (software), FOS: Physical sciences, Zero-point energy, 02 engineering and technology, 01 natural sciences, law.invention, Condensed Matter::Materials Science, law, Vacancy defect, Mesoscale and Nanoscale Physics (cond-mat.mes-hall), 0103 physical sciences, Physics::Atomic and Molecular Clusters, Gauge theory, 010306 general physics, Physics, Condensed Matter - Mesoscale and Nanoscale Physics, Condensed matter physics, Condensed Matter::Other, Graphene, Charge (physics), 021001 nanoscience & nanotechnology, High Energy Physics - Theory (hep-th), Electric potential, 0210 nano-technology, Parity anomaly |
| الوصف: | The study of vacancies in graphene is a topic of growing interest. A single vacancy induces a localized stable charge of order unity interacting with other charges of the conductor through an unscreened Coulomb potential. It also breaks the symmetry between the two triangular graphene sublattices hence inducing zero energy states at the Dirac points. Here we show the fractional and pseudo-scalar nature of this vacancy charge. A continuous Dirac model is presented which relates zero modes to vacuum fractional charge and to a parity anomaly. This relation constitutes an Index theorem and is achieved by using particular chiral boundary conditions, which map the vacancy problem onto edge state physics. Vacancies in graphene thus allow to realize prominent features of $2+1$ quantum electrodynamics but without coupling to a gauge field. This essential difference makes vacancy physics relatively easy to implement and an interesting playground for topological switching. Comment: 7 pages, 17 supplementary pages. 4 figures, 2 supplementary figures. V2 |
| تدمد: | 2469-9969 2469-9950 |
| URL الوصول: | https://explore.openaire.eu/search/publication?articleId=doi_dedup___::b5984dcb2815e0ae571c43bb4826e296 https://doi.org/10.1103/physrevb.102.075109 |
| حقوق: | OPEN |
| رقم الأكسشن: | edsair.doi.dedup.....b5984dcb2815e0ae571c43bb4826e296 |
| قاعدة البيانات: | OpenAIRE |
| تدمد: | 24699969 24699950 |
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